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'testers raient No. 112,8?3, niet March 21, 1871.

lMPROVEMENT iN MACHINES FOR GRINDING` CARRIAGE-SPRINGS.

The Schedule rererred to ln these Letters Patent and making pari: oi'the same.

To-ell persons to whom these presents may come:

Beit known that I, Hannon MAYHEWWENTWORTH, of Gardiner, of the county ofKennebec and State of Maine, have invented a new and useful Machine forGrinding Carriage-Springs and other articles oi' -like character; and Ido hereby declare. the same to be fully described in the followingspecification and represented in the accompanying drawing, of which-Figure 1 is a top view;

Figure 2, a front elevation;

Figure 3, a side elevation; and

Figure 4, a rear elevation of the said machine.

In such drawiugv A denotes the main frame, which supports not only theadjustable carriage B of the grinding-wheel, but the adjustablefeed-wheel frame H.

The carriage B, arranged, as represented, on and across the top of theframe A, is fastened thereon by means of clamp-nuts and screws, as shownata da a, the screws'being projected upward from the frame A and throughslots b,'made lengthwise on the carriage B, such admitting of thesaidcarriage being moved and adjusted in position on the frame Atransversely thereof'. A I

The said carriage B supports in suitable boxes, c c, the shaft d of thegrinding-stone or wheel C, whose periphery has formed in it a series ofchannels or'F grooves which are parallel to each other and extendentirely around the stone or wheel.

The endless belt d' goingaround a pulley, e, on the shaft d, and apulley, f, on a driving-shaft, g, serves to 'transmit rotary motion fromthe pulley f to the pulley e, and thereby put the grinding-wheel inrevolution.

Directly over the grinding-wheel are two feedwheels, D E, xed on thelower ends of vertical shafts, F G, supported vin an upright frame, H.'The said frame is to be secured to 'themain frame A so as tobeadjustable vertically relatively to it, the two being connected vbyclamp-screws and nuts, shown at h h, each of the screws going through aslit, t, made in the upright frame.

The two shafts F G, at or near their upper parts, are connected by a setof spur-gears, k l, the shafiiG being applied in its bearings so as tobe capable of .swingingfaway fromthe shaft' F, it being pressed towardthe said shaft F by a spring, m, and provided with means' by which itmay be drawn away from the said shaft F in order to move the feed=wheelE away from the'feed-wheel D. .I

Such-means consist of a yoke or link, u, a treadle, an', and a line, o,fastened to the said treadle and the yoke, and going around guidesarranged as shown at bevel-gear, q, fixed upon the upper end of theshaft F, engages with a bevel-pinion, fr', xed on one end of ahorizontal shaft, q, supported by the frame An endless belt, r, goingaround a pulley, s, and

At the rear of the frame H andthe grinding-wheel C a lever, t, isarranged and supported on a pitman, u, as represented, the outer arm ofthe lever being fixed t`o the lower end of a spring, c, depending from abracket, w.

A rope, x, extends down from the said arm of the said'lever to atreadle, y, arranged as represented.

In rearof the bite of the feed-wheels, and fixed to the frame H so as tobe capable of being adjusted vertically, is an abutment, z, which, withthe lever t, vserves to support and steady'ta spring and bear it uponthe grinding-wheel. The said lever tI term the presser. A

i This machine is to grind or reduce a carriage-spring, a leaf thereof,or a long flat bar on either of its two opposite edges, generallyspeaking, to round such edges. To accomplish this the Vspring o1` leaf,as the case may be, tobe dressed or reduced, is to be inserted in thebite of ,the'feed-wheels, which is to be supposed to be directly oversome one of the grooves of the periphery of the grindingfwheel.

As the spring may be fed along by the wheels it will pass underneath andagainst the abutment and over the inner arm of the'presser-le'ver,which, by

being forced upward, will force audserve to maintain the spring incontact with thegrinding-wheel; such wheel being supposed to be in rapidrevolution, will reduce the edge ofthe spring or leaf, as may berequired.

When the stone mayhave become too much worn in one 4groove thesnpportingcarriage B may be moved laterally on the frame A, so as tobring a fresh groove of the stone underneath the bite'of thefeedwheels.So, as the stone may become reduced in diameter, the feed-wheels may belowered and adj usted to it by lowering their sustaining-frame.

From the above it will be seen that the operative parts for Ifeeding andsupporting the spring relatively to the grinding-wheel or stone are adjnstable, so as to enable them to be brought into their proper relationswith the stone as it may become worn from time to time.

I claim- 1. The combination and arrangement of the carriage B and theframe H, provided with adjustments,

